how to use postgresql in mac code example

Example 1: how to open postgresql in mac

brew services start postgresqlpsql postgres

Example 2: postgresql create database mac

sudo psql -U postgres
psql: FATAL:  role "postgres" does not exist

Example 3: how to open postgresql in mac

/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

Example 4: postgresql create database mac

postgres=# DROP USER USER_NAME;
DROP ROLE